An electric vehicle and its battery extension structure

Abstract

This disclosure relates to the field of power battery technology, and provides an electric drive vehicle and its battery extension structure, including a frame and at least one battery sleeve fixed within the frame. The battery sleeve extends longitudinally along the frame, forming a receiving cavity with one end open to form a loading and unloading port. A battery module is installed within the receiving cavity. A first guide portion and a second guide portion are provided between the receiving cavity and the battery module, slidingly engaging along the axial direction of the battery sleeve. The bottom wall of the receiving cavity and the battery module are electrically connected by interlocking. The battery module enters and exits the receiving cavity through the loading and unloading port. This invention can utilize the longitudinal space of the frame to add an extended battery, improving the overall battery capacity and space utilization of the vehicle, while enabling the battery module to complete installation, positioning, and electrical connection under guiding action, thus improving the stability of assembly and electrical connection.

Description

Technical Field

[0001] This disclosure relates to the field of power battery technology, and more specifically, to an electric drive vehicle and its battery extension structure. Background Technology

[0002] The battery in an electric vehicle is an onboard energy storage device used to store and supply electrical energy to the drive motor. Its capacity, installation location, and assembly stability directly affect the vehicle's range, center of gravity, and safety. For off-road motorcycles, gasoline-powered models typically require exhaust pipes and corresponding exhaust structures to be arranged on one or both sides of the rear of the frame, thus creating a structural arrangement area extending along the front-rear direction of the vehicle at the rear of the frame. Electric off-road motorcycles do not require such exhaust structures, thus utilizing the corresponding unused area.

[0003] Current electric off-road motorcycles typically place the main battery in the middle of the frame to balance the vehicle's center of gravity and structural compactness. However, the middle of the frame must also accommodate the drive motor, controller, shock absorbers, and other load-bearing components, leaving limited space for battery capacity expansion. Given the current battery energy density and overall vehicle size, simply increasing the size of the central main battery is insufficient to continuously improve the vehicle's battery capacity, especially under high-power output conditions such as off-road driving, where the vehicle's range is easily limited.

[0004] Therefore, there is a need to provide an electric drive vehicle and its battery extension structure to solve the problems of limited battery capacity and driving range caused by the overall vehicle layout space of existing electric drive vehicles. Summary of the Invention

[0005] The main purpose of this disclosure is to provide an electric drive vehicle and its battery extension structure, which aims to solve the problems of limited battery capacity and driving range of existing electric drive vehicles due to the constraints of vehicle layout space.

[0006] The present invention adopts the following technical solution: A battery extension structure for an electric drive vehicle includes a frame and at least one battery sleeve fixed within the frame. The battery sleeve extends longitudinally along the frame, has a receiving cavity formed inside, and has an opening at one end to form a loading and unloading port. The cavity contains a battery module. A first guide and a second guide are provided between the cavity and the battery module, respectively, and they slide along the axial direction of the battery sleeve. The bottom wall of the cavity and the battery module are electrically connected by insertion. The battery module enters and exits the cavity through the loading and unloading port.

[0007] Furthermore, the bottom wall of the receiving cavity and the battery module are respectively provided with male end connectors and female end connectors for mutual insertion; The loading and unloading port is hinged with a sleeve cover for sealing the battery module. The outer periphery of the battery sleeve is provided with a locking component. The locking component is used to apply a locking force along the axial direction of the sleeve cover to the sleeve cover in the sealed state. The outer periphery of the battery sleeve is rotatably provided with an unlocking rod extending along the axial direction of the battery sleeve. One end of the unlocking rod is used to pry the locking component, and the other end forms a pressing part away from the loading and unloading port.

[0008] Furthermore, the battery sleeve includes a cylindrical body that forms a receiving cavity, and a mounting seat extending axially along the outer periphery of the cylindrical body is provided. The end face of the mounting seat away from the cylindrical body is recessed to form a receiving groove for receiving and swinging the unlocking rod. A hinge seat is provided on the side of the loading and unloading port away from the mounting base, and the hinge seat is rotatably connected to the sleeve cover.

[0009] Furthermore, a locking groove is provided at one end of the mounting base near the loading and unloading port, the locking component is disposed in the locking groove, and one end of the unlocking rod extends into the locking groove in an L-shape.

[0010] Furthermore, the first guide portion consists of two opposing strip slide rails, which protrude along the cylinder towards the receiving cavity and extend along the axial direction of the cylinder, and have two opposing guide sides. The second guide portion consists of two oppositely arranged sliding grooves. The sliding grooves are recessed along the outer peripheral surface of the battery module and extend along the axial direction of the battery module. The sliding grooves have oppositely arranged sidewalls. The strip rail extends into the corresponding sliding groove, and the two guide sides slide in cooperation with the two sidewalls respectively.

[0011] Furthermore, the battery module includes a cylindrical housing adapted to the receiving cavity, the cylindrical housing having an insertion end near the bottom wall of the receiving cavity and an operating end facing the loading and unloading port; The slide grooves pass through the insertion end and the operating end respectively. The female end connector is embedded in the insertion end. The operating end is provided with a handle. The two slide grooves pass through the opposite sides of the handle respectively.

[0012] Furthermore, the sleeve cover includes a cover plate corresponding to the loading and unloading port and a periphery extending from the periphery of the cover plate toward the battery sleeve, wherein the periphery surrounds at least a portion of the outer periphery of the tail end of the cylinder when the sleeve cover is in a sealed state. The lower part of the cover plate is provided with two hinge ears arranged at intervals. The hinge seat is located between the two hinge ears. A hinge pin is rotatably inserted between the hinge seat and the two hinge ears. The side of the cover plate away from the hinge ears is provided with a locking part extending along the axial direction of the cover, which is used to extend into the locking groove and cooperate with the locking assembly to lock.

[0013] Furthermore, the latching part is an L-shaped plate latch. The free end of the latching part forms an inlet ramp, a transition top, and a locking step in sequence along the entry direction when the cover is in the sealed state. The inlet ramp is inclined relative to the extension direction of the plate latch, and the locking step has a locking surface facing the opening direction of the cover.

[0014] Furthermore, the locking assembly includes a locking member that cooperates with the latch portion to block and a first elastic member that applies a locking force to the locking member. The locking groove is provided with a guide hole for the locking member to slide. The end of the locking member is slidably disposed in the guide hole, and the first elastic member is distributed in the guide hole. The guide hole passes through the end of the mounting base away from the cylinder, and a cover plate is fixedly provided on the end face of the guide hole. The opposite ends of the first elastic member abut against the cover plate and the locking member, respectively.

[0015] Furthermore, the guide holes are distributed in a direction perpendicular to the axis of the cylinder, and the guide holes include two symmetrical sets. The opposite ends of the locking member are slidably connected to the two guide holes, and the L-shaped end of the unlocking rod abuts against the bottom end of the locking member.

[0016] Furthermore, the unlocking rod has shaft holes on both sides, and a pivot pin passes through the shaft holes. The two ends of the pivot pin are rotatably connected to the two side walls of the receiving groove. The pivot pin separates the unlocking rod into an operating arm extending toward the receiving cavity and a lifting arm extending toward the loading and unloading port. The end of the operating arm forms a pressing part with a width greater than the width of the unlocking rod body, and the end of the lifting arm is bent toward the locking member to form an L-shaped end of the unlocking rod.

[0017] Furthermore, the operating arm is provided with a spring positioning part on one end face facing the bottom wall of the receiving groove, and a second elastic element is provided between the spring positioning part and the bottom wall of the receiving groove. The second elastic element is distributed between the pivot pin and the pressing part. The second elastic member biases the operating arm away from the bottom wall of the receiving groove and biases the lifting arm towards the bottom wall of the receiving groove, so that when the pressing part moves toward the bottom wall of the receiving groove, the lifting arm swings upward around the pivot pin to lift the locking member.

[0018] An electric vehicle employing the battery extension structure of an electric vehicle as described in any of the preceding claims.

[0019] Beneficial effects: In this invention, at least one battery sleeve is fixed inside the vehicle frame and extends longitudinally along the frame, forming an independent battery housing cavity inside the sleeve. The battery module can be longitudinally inserted through the loading / unloading port. This utilizes the available space within the vehicle frame distributed longitudinally to create extended battery mounting positions, increasing the number of assembleable battery modules without increasing the space occupied by the original main battery. This improves the overall vehicle battery capacity and space utilization, meeting the needs for further vehicle capacity expansion.

[0020] Meanwhile, the receiving cavity and the battery module are slidably engaged along the axial direction of the battery sleeve through the first guide and the second guide, so that the battery module is continuously guided and constrained during the installation process and moves in a predetermined direction; when the battery module moves to the bottom of the receiving cavity, its electrical connection parts are interlocked on the basis of the above guidance, so that the battery module installation and positioning and electrical connection process are connected, thereby improving the stability of assembly and electrical connection while realizing battery expansion. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall structure of a battery extension structure for an electric drive vehicle according to the present invention. Figure 2 This is an exploded view of the battery extension structure of an electric drive vehicle according to the present invention; Figure 3 This is a schematic diagram of the structure of the battery sleeve of the present invention; Figure 4 This is an exploded structural diagram of the battery sleeve of the present invention; Figure 5 This is a schematic diagram of the connector structure of the present invention; Figure 6 This is a schematic diagram of the guiding structure of the present invention; Figure 7 This is a schematic diagram of the seat lock mechanism of the present invention; in: 1. Frame; 2. Battery sleeve; 21. Receiving cavity; 22. Loading / unloading port; 23. First guide section; 24. Male connector; 25. Cylinder body; 26. Mounting base; 27. Receiving groove; 28. Hinge seat; 29. ​​Locking groove; 30. Guide hole; 3. Battery module; 31. Second guide section; 32. Female connector; 33. Cylindrical housing; 34. Handle; 4. Cover; 41. Cover plate; 42. Hinge ear; 43. Locking part; 431. Guide slope; 43 2. Transition top; 433. Locking step; 5. Locking assembly; 51. Locking element; 52. First elastic element; 53. Cover plate; 6. Unlocking lever; 61. Pressing part; 62. Operating arm; 63. Lifting arm; 7. Hinge pin; 8. Pivot pin; 9. Second elastic element; 10. Seat cover; 101. Seat lock hook; 11. Seat lock mechanism; 111. Lock body; 112. Lock tongue; 113. Release part; 12. Lock cylinder; 13. Rotating output element; 14. Flexible cable; The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0022] It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0023] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of the stated features. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0024] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, a direct connection, or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0025] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0026] Reference Figures 1 to 7 This invention proposes a battery extension structure for an electric drive vehicle, including a frame 1 and at least one battery sleeve 2 fixed within the frame 1. The battery sleeve 2 extends longitudinally along the frame 1, and a receiving cavity 21 is formed inside the battery sleeve 2, with one end open to form a loading and unloading port 22. A battery module 3 is installed in the receiving cavity 21. A first guide portion 23 and a second guide portion 31 are respectively provided between the receiving cavity 21 and the battery module 3, which slide along the axial direction of the battery sleeve 2. The bottom wall of the receiving cavity 21 and the battery module 3 are electrically connected by interlocking. The battery module 3 enters and exits the receiving cavity 21 through the loading and unloading port 22.

[0027] In the above embodiment, the frame 1 has an installation area extending along the longitudinal direction of the vehicle, which is the longitudinal direction of the frame 1. The battery sleeve 2 is fixedly installed in this installation area, so that the axial direction of the battery sleeve 2 is substantially consistent with the longitudinal direction of the frame 1. The battery sleeve 2 can be fixed to the frame 1 by welding, fastener connection, or bracket connection, thereby maintaining the positional stability of the battery sleeve 2 during vehicle operation and the installation and removal of the battery module 3. By setting the battery sleeve 2 in the longitudinal space of the frame 1, an independent battery expansion position can be formed outside the original power battery, thereby increasing the number of battery modules 3 and battery capacity that can be installed in the vehicle. Depending on the overall vehicle structure and range requirements, one, two, or more battery sleeves 2 can be set; in a preferred embodiment, the battery sleeve 2 and the battery module 3 are set in two sets respectively.

[0028] The battery sleeve 2 is a hollow component with a predetermined axial length. Its interior forms a receiving cavity 21 for accommodating the battery module 3. One end of the receiving cavity 21 is open, forming a loading / unloading port 22. The end opposite to the loading / unloading port 22 forms the bottom of the receiving cavity 21. The outer contour of the battery module 3 is adapted to the receiving cavity 21, allowing the battery module 3 to be pushed into the receiving cavity 21 along the axial direction of the battery sleeve 2 through the loading / unloading port 22, and to be removed from the receiving cavity 22 in the opposite direction. This enables the battery module 3 to be detachably installed relative to the battery sleeve 2.

[0029] A first guide portion 23 is disposed in the receiving cavity 21, and a second guide portion 31 is correspondingly disposed in the battery module 3. The first guide portion 23 and the second guide portion 31 are slidably engaged along the axial direction of the battery sleeve 2. Specifically, the first guide portion 23 and the second guide portion 31 can adopt a mutually cooperating protruding structure and a recessed structure, or other structural forms that can form a sliding guide along the axial direction. When the battery module 3 moves from the loading / unloading port 22 into the receiving cavity 21, the first guide portion 23 and the second guide portion 31 maintain a continuous sliding engagement, causing the battery module 3 to move along a predetermined axial path and limiting excessive radial offset or circumferential rotation of the battery module 3 relative to the battery sleeve 2. Therefore, even when the battery module 3 has undergone a long insertion stroke, its installation posture can still be continuously constrained, providing a guiding basis for the positioning and electrical connection of the battery module 3 when it reaches the bottom of the receiving cavity 21.

[0030] The bottom wall of the receiving cavity 21 and the battery module 3 are provided with mutually cooperating electrical connection structures, and the insertion direction of the two corresponds to the installation direction of the battery module 3. As the battery module 3 gradually moves towards the bottom of the receiving cavity 21 along the first guide portion 23 and the second guide portion 31, the electrical connection position of the battery module 3 approaches the electrical connection position of the bottom wall of the receiving cavity 21 along its entire axial direction; under the continuous guiding action of the first guide portion 23 and the second guide portion 31, the two maintain the corresponding radial position and circumferential posture, and complete the mutual insertion by utilizing the axial displacement of the final stage of battery module 3 installation. Thus, the mechanical installation process of the battery module 3 can be connected with the electrical connection process, increasing the battery capacity by utilizing the longitudinal space of the frame 1, while improving the stability of battery module 3 installation positioning and electrical connection.

[0031] In one embodiment, a male connector 24 and a female connector 32 are respectively provided between the bottom wall of the receiving cavity 21 and the battery module 3 for mutual insertion; the loading and unloading port 22 is hinged with a sleeve cover 4 for sealing the battery module 3, and a locking component 5 is provided on the outer periphery of the battery sleeve 2. The locking component 5 is used to apply a locking force along the axial direction of the sleeve cover 4 to the sleeve cover 4 in the sealed state. The outer periphery of the battery sleeve 2 is rotatably provided with an unlocking rod 6 extending along the axial direction of the battery sleeve 2. One end of the unlocking rod 6 is used to pry the locking component 5, and the other end forms a pressing part 61 away from the loading and unloading port 22.

[0032] In the above embodiment, the male connector 24 is disposed on the bottom wall of the receiving cavity 21, and the female connector 32 is disposed on the end of the battery module 3 facing the bottom wall of the receiving cavity 21. The male connector 24 and the female connector 32 are arranged opposite each other along the axial direction of the battery sleeve 2. When the battery module 3 is inserted into the predetermined installation position of the receiving cavity 21 along the first guide portion 23 and the second guide portion 31, the male connector 24 and the female connector 32 interlock with each other as the battery module 3 moves axially, thereby establishing an electrical connection between the battery module 3 and the vehicle's electrical system. It should be noted that in other embodiments, the positions of the male connector 24 and the female connector 32 can be interchanged, as long as they can complete the corresponding interlocking as the battery module 3 is inserted.

[0033] The cover 4 is rotatably connected to the loading / unloading port 22 and can rotate between the open and closed states. When the cover 4 is in the open state, the loading / unloading port 22 is exposed for the battery module 3 to be installed or removed; after the battery module 3 is installed, the cover 4 is rotated to the closed state, so that the cover 4 covers the loading / unloading port 22 and is located on the exit path of the battery module 3 toward the loading / unloading port 22, thereby axially limiting the battery module 3.

[0034] The locking component 5 is located on the outer periphery of the battery sleeve 2 near the loading / unloading port 22 and cooperates with the sleeve cover 4. When the sleeve cover 4 is rotated to the blocking state, the locking component 5 applies a locking action to the sleeve cover 4, keeping the sleeve cover 4 in the blocking position. Since the sleeve cover 4 is located on the axial exit path of the battery module 3, the locked sleeve cover 4 can restrict the movement of the battery module 3 along the loading / unloading port 22 direction; combined with the constraint of the radial position and circumferential attitude of the battery module 3 by the first guide part 23 and the second guide part 31, the battery module 3 can maintain a relatively stable position after installation, and it is beneficial to maintain a stable insertion state between the male end connector 24 and the female end connector 32.

[0035] The unlocking lever 6 extends axially along the outer periphery of the battery sleeve 2 and is rotatable relative to the battery sleeve 2. One end of the unlocking lever 6 corresponds to the locking component 5 and is used to pry the locking component 5 when the unlocking lever 6 rotates; the other end of the unlocking lever 6 forms a pressing part 61, and the pressing part 61 and the loading / unloading port 22 are spaced apart axially along the battery sleeve 2. When it is necessary to remove the battery module 3, a pressing force is applied to the pressing part 61, causing the unlocking lever 6 to rotate, and driving the locking component 5 to release the lock on the cover 4 through its other end. The cover 4 can then be rotated open to allow the battery module 3 to be removed through the loading / unloading port 22. By separating the locking position of the locking component 5 and the operating position of the pressing part 61 along the axial direction of the battery sleeve 2 through the unlocking lever 6, the cover 4 can be axially limited while providing an easy position for unlocking the cover 4 and disassembling the battery module 3.

[0036] In one embodiment, the battery sleeve 2 includes a cylindrical body 25 that forms a receiving cavity 21. A mounting seat 26 extending axially along the outer periphery of the cylindrical body 25 is provided. The end face of the mounting seat 26 away from the cylindrical body 25 is recessed to form a receiving groove 27 for receiving and swinging the unlocking rod 6. The loading and unloading port 22 is provided with a hinge seat 28 on the side away from the mounting base 26, and the hinge seat 28 is rotatably connected to the sleeve cover 4.

[0037] In the above embodiment, the battery sleeve 2 is composed of a cylindrical body 25 and a mounting base 26. The peripheral wall of the cylindrical body 25 forms a receiving cavity 21 for the axial movement of the battery module 3. The mounting base 26 is disposed on the outer periphery of the cylindrical body 25 along its length, so that the mounting base 26 and the cylindrical body 25 have a fixed relative position. The side of the mounting base 26 opposite to the cylindrical body 25 is recessed inward to form an elongated receiving groove 27. The unlocking rod 6 is at least partially located in the receiving groove 27 and can swing within the groove with its rotational connection position as the center. The two side walls of the receiving groove 27 can limit the circumferential displacement of the unlocking rod 6 along the cylindrical body 25, so that the movement of the unlocking rod 6 is basically kept within the predetermined plane passing through the locking assembly 5, avoiding lateral torsion of the unlocking rod 6 after being pressed, which would change its contact position with the locking assembly 5. The hinge seat 28 is located on the side of the loading and unloading port 22 away from the mounting seat 26. The sleeve cover 4 is rotatably connected to the cylinder 25 from this side, so that the rotatable connection position and the locking position of the sleeve cover 4 are distributed on opposite sides of the loading and unloading port 22.

[0038] After the cover 4 is closed, the hinge seat 28 provides rotational support on one side, and the locking assembly 5 holds the other side. The two supports are arranged across the loading and unloading port 22, which can reduce the space for the cover 4 to swing around in a non-predetermined direction under vehicle vibration, so that the cover 4 is stably located on the exit path of the battery module 3, and then cooperates with the guide structure in the receiving cavity 21 to maintain the axial installation position of the battery module 3.

[0039] In one example, the mounting base 26 has a locking groove 29 at one end near the loading / unloading port 22, the locking component 5 is disposed in the locking groove 29, and one end of the unlocking rod 6 extends into the locking groove 29 in an L-shape.

[0040] In the above embodiment, the mounting base 26 near the loading and unloading port 22 forms an inwardly recessed locking groove 29. The locking groove 29 is adjacent to or connected to the receiving groove 27 that accommodates the unlocking rod 6 along the axial direction of the cylinder 25. The locking assembly 5 is centrally installed in the area defined by the locking groove 29.

[0041] The groove wall of the locking groove 29 provides installation and movement boundaries for the locking assembly 5, keeps the locking assembly 5 in a stable position relative to the latching cover 4, and reduces interference from external components on the movement path of the locking assembly 5.

[0042] The unlocking lever 6 extends from the receiving groove 27 toward the loading / unloading port 22. Its end near the locking groove 29 is bent into an L-shape, allowing the lever, arranged axially along the cylinder 25, to transmit the rotational displacement generated by the pressing part 61 to the inside of the locking groove 29 via the bent section. The L-shaped end may include a bent arm connected to the lever and a push arm located below the locking assembly 5. After the pressing part 61 is subjected to force, the unlocking lever 6 swings around the rotating connection, and the push arm moves accordingly in the release direction of the locking assembly 5. Since the working ends of both the locking assembly 5 and the unlocking lever 6 are confined within the locking groove 29, their contact position is less likely to change due to vehicle vibration or lateral displacement of the lever. This maintains consistency in the locking and unlocking of the cover 4 during repeated locking and unlocking, and establishes a stable transmission connection between the locking operation position and the pressing position away from the loading / unloading port 22 through the same lever.

[0043] In one example, the first guide portion 23 consists of two opposing strip slides, which protrude along the cylinder 25 toward the receiving cavity 21 and extend along the axial direction of the cylinder 25, and the strip slides form two opposing guide sides. The second guide portion 31 consists of two oppositely arranged sliding grooves. The sliding grooves are recessed along the outer peripheral surface of the battery module 3 and extend along the axial direction of the battery module 3. The sliding grooves have oppositely arranged sidewalls. The strip rail extends into the corresponding sliding groove, and the two guide sides slide in cooperation with the two sidewalls respectively.

[0044] In the above embodiment, two strip-shaped slide rails extending continuously along their axial direction are provided inside the cylindrical body 25. The two strip-shaped slide rails protrude into the cavity from the inner circumference of the receiving cavity 21 and are distributed on opposite sides of the receiving cavity 21. Each strip-shaped slide rail has two guide sides extending along the sliding direction. Two axial sliding grooves are correspondingly formed on the outer periphery of the battery module 3. Each sliding groove is surrounded by a groove bottom and groove sidewalls located on both sides of the groove bottom.

[0045] When the battery module 3 is pushed in through the loading / unloading port 22, the strip rails enter the corresponding slots, and the guide side and the slot sidewall form a surface contact or adjacent fit with a predetermined fit clearance. The two sets of opposing rail slots constrain the battery module 3 from different positions, and the offset caused by the gap on one side will not be directly converted into a large rotation of the battery module 3 around its own axis; at the same time, the rails remain in the slots along the main loading stroke, so that the radial position and circumferential attitude are still constrained before approaching the bottom wall of the receiving cavity 21. When the male end connector 24 and the female end connector 32 begin to contact, the battery module 3 has already determined its attitude relative to the cylinder 25 by the two sets of rail slots, and its remaining axial displacement can be converted into the insertion displacement of the connector relatively stably, reducing the lateral component force borne by the connector due to the skewed contact. After the battery module 3 is installed in place, the guide side and the slot sidewall can also share the lateral load generated by the vibration of the whole vehicle, thereby limiting the swing of the battery module 3 in the receiving cavity 21.

[0046] In one example, the battery module 3 includes a cylindrical housing 33 adapted to the receiving cavity 21, the cylindrical housing 33 having an insertion end near the bottom wall of the receiving cavity 21 and an operating end facing the loading and unloading port 22; The slide grooves pass through the insertion end and the operating end respectively. The female end connector 32 is embedded in the insertion end. The operating end is provided with a handle 34. The two slide grooves pass through the opposite sides of the handle 34 respectively.

[0047] In the above embodiment, the cylindrical housing 33 of the battery module 3 extends axially along the battery sleeve 2, and its outer contour is adapted to the cross-section of the receiving cavity 21, with an insertion end and an operating end formed at both ends. The insertion end is the end that first enters the receiving cavity 21 when the battery module 3 is installed, and the female end connector 32 is embedded in this end, so that the outer periphery of the female end connector 32 is at least partially supported and protected by the end structure of the cylindrical housing 33, and the female end connector 32 maintains a fixed circumferential position relative to the two sliding grooves.

[0048] Two sliding grooves are arranged along the entire length of the cylindrical housing 33 and pass through the insertion end and the operating end respectively. The strip-shaped slide rail can engage with the slide rail as soon as the battery module 3 enters the loading / unloading port 22, and continue to provide guidance when the battery module 3 is almost fully inserted or not yet fully removed, preventing the battery module 3 from losing constraint at both ends of the loading / unloading stroke. A handle 34 is provided at the operating end, with the gripping part of the handle 34 spaced apart from the end face of the cylindrical housing 33, allowing the operator to apply pushing or pulling force along the axial direction of the battery sleeve 2. The two sliding grooves pass through opposite sides of the handle 34, so that the handle 34 does not obstruct the path of the slide rail into the slide rail, and also makes the loading / unloading force acting on the handle 34 closer to the axial center area of ​​the cylindrical housing 33. Thus, the battery module 3 is less likely to tilt due to force bias during the pushing and pulling process, and the female end connector 32 can approach or move away from the male end connector 24 along the constrained direction with the cylindrical housing 33.

[0049] In one example, the sleeve cover 4 includes a cover plate 41 corresponding to the loading and unloading port 22 and a periphery extending from the periphery of the cover plate 41 toward the battery sleeve 2. The periphery is provided around at least a portion of the outer periphery of the tail end of the cylinder 25 when the sleeve cover 4 is in a sealed state. The lower part of the cover plate 41 is provided with two hinge ears 42 arranged at intervals. The hinge seat 28 is located between the two hinge ears 42. The hinge seat 28 and the two hinge ears 42 are rotatably connected by a hinge pin 7. The side of the cover plate 41 away from the hinge ears 42 is provided with a locking part 43 extending along the axial direction of the cover 4, which is used to extend into the locking groove 29 and cooperate with the locking assembly 5 to lock.

[0050] In the above embodiment, the sleeve cover 4 is composed of a cover plate 41 and a surrounding edge. The outline of the cover plate 41 corresponds to the loading and unloading port 22, and the surrounding edge extends from the periphery of the cover plate 41 toward the cylinder 25. When the sleeve cover 4 is closed, the surrounding edge is fitted or surrounds at least part of the outer periphery of the tail end of the cylinder 25, so that the sleeve cover 4 and the cylinder 25, in addition to the hinged position and the locking position, also form a circumferential positional engagement through the surrounding edge with the tail end of the cylinder 25. This can limit the lateral misalignment of the cover plate 41 relative to the loading and unloading port 22 and reduce the possibility of the sleeve cover 4 transmitting off-center load to the locking part 43 after being subjected to vibration.

[0051] Two spaced-apart hinge ears 42 are provided at the lower part of the cover plate 41. A hinge seat 28 on the cylinder 25 extends between the two hinge ears 42. The hinge pin 7 passes through the two hinge ears 42 and the hinge seat 28 in sequence, so that the hinge seat 28 is supported by both sides. Compared with a single-sided connection, the two hinge ears 42 can limit the axial movement of the sleeve cover 4 along the hinge pin 7 and reduce the wobble of the cover plate 41 during rotation. The locking part 43 is provided on the side of the cover plate 41 away from the hinge ears 42 and extends towards the locking groove 29 when the sleeve cover 4 is closed. After the sleeve cover 4 is rotated to the sealing position, the locking part 43 enters the locking groove 29 and cooperates with the locking assembly 5, so that the hinge pin 7 and the locking part 43 are located on both sides of the loading and unloading port 22. The cover plate 41 thus stably spans the exit path of the battery module 3 and, together with the guide in the receiving cavity 21, defines the installation posture and axial position of the battery module 3.

[0052] In one embodiment, the latching part 43 is an L-shaped plate latch. The free end of the latching part 43 forms an introduction slope 431, a transition top 432 and a locking step 433 in sequence along the entry direction when the cover 4 is in the blocked state. The introduction slope 431 is inclined relative to the extension direction of the plate latch, and the locking step 433 has a locking surface facing the opening direction of the cover 4.

[0053] In the above embodiment, the locking part 43 is composed of a fixed section and an insertion section that are bent and connected to each other. The fixed section is connected to the cover plate 41, and the insertion section extends into the locking groove 29 when the cover 4 is closed. The free end of the insertion section sequentially forms an guide slope 431, a transition top 432, and a locking step 433. The guide slope 431 faces the locking member 51 and gradually approaches the movement axis of the locking member 51 along the insertion direction.

[0054] When the cover 4 rotates to the sealing position, the guide slope 431 contacts the locking member 51, converting the rotational displacement of the cover 41 into the retraction displacement of the locking member 51 along the guide direction. After the transition top 432 passes over the locking member 51, the locking member 51 returns to the locking step 433 side under the action of elastic force. The depth of the locking step 433 is adapted to the extension of the locking member 51 in the locked state. The locking surface faces the opening direction of the cover 4, so that when the cover 4 is subjected to an outward rotational load, the load is transmitted to the locking member 51 and the mounting base 26 through the locking surface, and the locking member 51 will not retract on its own along the guide slope 431. The latch part 43 and the hinge position are located on both sides of the loading and unloading port 22. After the cover 41 is closed, it can stably span the exit path of the battery module 3, thereby restricting the axial movement of the battery module 3 together with the guide in the receiving cavity 21 and reducing the repeated pulling of the electrical connection parts.

[0055] In one embodiment, the locking assembly 5 includes a locking member 51 that cooperates with the latch portion 43 to block and a first elastic member 52 that applies a locking force to the locking member 51. The locking groove 29 is provided with a guide hole 30 for the locking member 51 to slide. The end of the locking member 51 is slidably disposed in the guide hole 30, and the first elastic member 52 is distributed in the guide hole 30. The guide hole 30 passes through the end of the mounting base 26 away from the cylinder 25. A cover plate 53 is fixedly provided on the end face of the guide hole 30. The two opposite ends of the first elastic member 52 abut against the cover plate 53 and the locking member 51, respectively.

[0056] In the above embodiment, the locking assembly 5 is disposed in the locking groove 29 at the end of the mounting base 26. The locking member 51 has at least a locking section that contacts the latch portion 43 and a guide section that extends into the guide hole 30. The guide section is capable of reciprocating along the direction defined by the guide hole 30. The first elastic member 52 is accommodated in the guide hole 30, with one end abutting against a step, flange, or end face on the locking member 51, and the other end abutting against a cover plate 53 fixed to the outer end of the guide hole 30. The cover plate 53 can be fixed to the mounting base 26 by screws, riveting, or press-fitting, and closes the end of the guide hole 30 away from the cylinder 25, thereby providing stable reaction force support for the first elastic member 52, while restricting the locking member 51 and the first elastic member 52 from disengaging from the guide hole 30. When the latching part 43 presses against the locking member 51, the locking member 51 can only retract along the guide hole 30, and is not prone to lateral deviation. After the latching part 43 passes, the first elastic member 52 releases its elastic potential energy, causing the locking member 51 to return to the locking surface side. The guide hole 30, the cover plate 53 and the locking member 51 form a defined linear motion pair, so that the cover 4 maintains a consistent locking position under multiple closing and vehicle vibration conditions. The cover 4 thus continuously bears the limiting position of the battery module 3 in the direction of the loading and unloading port 22, avoiding repeated displacement in this direction on the connector.

[0057] In one embodiment, the guide holes 30 are distributed along a direction perpendicular to the axis of the cylinder 25, and the guide holes 30 include two symmetrical sets. The two ends of the locking member 51 are slidably connected to the two guide holes 30, and the L-shaped end of the unlocking rod 6 abuts against the bottom end of the locking member 51.

[0058] In the above embodiment, the mounting base 26 is provided with two sets of guide holes 30 symmetrical about the middle of the locking groove 29, and the extension direction of the two guide holes 30 is perpendicular to the axis of the cylinder 25. The locking member 51 can be made into a rod-shaped member that spans the locking groove 29, with its opposite ends forming guide ends and sliding into the two guide holes 30 respectively, and the middle part between the two guide ends forming a locking section that cooperates with the plate-shaped latch. The diameter of the two guide holes 30 is adapted to the outer diameter of the corresponding guide ends and a sliding gap is maintained. The two guide ends are supported by the corresponding guide holes 30 respectively. When the locking member 51 is pushed by the latch part 43 or lifted by the unlocking rod 6, both ends move synchronously in the same direction, which can reduce the tilting, jamming and inconsistent locking depth caused by unilateral force.

[0059] The end of the unlocking lever 6 near the loading / unloading port 22 is bent into an L-shape. The bent end extends into the locking groove 29 and abuts against the lower side of the locking member 51. After the pressing part 61 is subjected to force, the bent end applies a lifting force from below the locking member 51, causing the two guide ends of the locking member 51 to simultaneously overcome the elastic element and exit the locking surface. The symmetrical guidance also distributes the opening load transmitted by the latch part 43 to both sides of the mounting base 26, making the cover 4 less prone to loosening due to the deflection of the locking member 51, thus maintaining the stable axial limiting state of the battery module 3.

[0060] In one embodiment, the unlocking rod 6 has shaft holes on opposite sides, and a pivot pin 8 passes through the shaft holes. The opposite ends of the pivot pin 8 are rotatably connected to the two side walls of the receiving groove 27. The pivot pin 8 separates the unlocking rod 6 into an operating arm 62 extending toward the receiving cavity 21 and a lifting arm 63 extending toward the loading and unloading port 22. The end of the operating arm 62 forms a pressing part 61 with a width greater than the width of the unlocking rod 6. The end of the lifting arm 63 is bent toward the locking member 51 to form an L-shaped end of the unlocking rod 6.

[0061] In the above embodiment, the unlocking lever 6 is an elongated lever arranged axially along the battery sleeve 2. Coaxial shaft holes are formed on opposite sides of the middle portion of the lever body, and the pivot pin 8 passes through these shaft holes, with its two ends supported by the side walls of the receiving groove 27. The side walls provide double-sided support for the pivot pin 8, restricting the rotation of the unlocking lever 6 within the plane defined by the receiving groove 27 and reducing torsional offset when the lever body is under pressure.

[0062] Pivot pin 8 divides the rod into an operating arm 62 extending toward the inner end of the receiving cavity 21 and a lifting arm 63 extending toward the loading / unloading port 22. The end of the operating arm 62 forms a pressing part 61 with a lateral dimension larger than the width of the rod to increase the contact area for fingers and reduce lateral load during pressing. The end of the lifting arm 63 bends toward the locking member 51, with the bent section located below the locking member 51. When the pressing part 61 moves toward the bottom wall of the receiving groove 27, the operating arm 62 swings downward around the pivot pin 8, and the lifting arm 63 swings upward simultaneously, pushing the locking member 51 away from the locking surface. The locking action position can thus still be set near the sleeve cover 4, while the manual operation position moves axially along the sleeve to an area away from the loading / unloading port 22; the unlocking action is transmitted through the rotation of a constrained lever, eliminating the need for an exposed handle around the loading / unloading port 22 and not changing the axial holding relationship between the sleeve cover 4 and the battery module 3.

[0063] In one embodiment, the operating arm 62 is provided with a spring positioning part on one end face facing the bottom wall of the receiving groove 27, and a second elastic element 9 is provided between the spring positioning part and the bottom wall of the receiving groove 27. The second elastic element 9 is distributed between the pivot pin 8 and the pressing part 61. The second elastic member 9 biases the operating arm 62 away from the bottom wall of the receiving groove 27 and biases the lifting arm 63 towards the bottom wall of the receiving groove 27, so that when the pressing part 61 moves toward the bottom wall of the receiving groove 27, the lifting arm 63 swings upward around the pivot pin 8 to lift the locking member 51.

[0064] In the above embodiment, a spring positioning part is formed on the side of the operating arm 62 facing the bottom wall of the receiving groove 27. The spring positioning part can be a positioning post, a positioning hole, or an annular limiting boss. A support surface is formed on the bottom wall of the receiving groove 27 at the corresponding position, and the second elastic member 9 is pressed between the two. The second elastic member 9 is located between the pivot pin 8 and the pressing part 61, so that its elastic force generates a biasing force on the operating arm 62 away from the bottom wall of the receiving groove 27, and the lifting arm 63 is held in a position close to the bottom wall of the receiving groove 27 by the pivot pin 8.

[0065] When the cover 4 is in the locked state, the lifting arm 63 will not continuously press against the locking member 51. The locking member 51 can fully enter the locking step 433 under the action of the first elastic member 52, and vehicle vibration will not easily cause the unlocking lever 6 to rotate to the release position on its own. After the pressing part 61 is subjected to external force, the second elastic member 9 is compressed, the lifting arm 63 swings upward and lifts the locking member 51; after the external force is removed, the second elastic member 9 pushes the operating arm 62 to reset, the lifting arm 63 then moves away from the locking member 51, and the locking member 51 is then restored to the locked position by the first elastic member 52. The two sets of elastic reset relationships constrain the unlocking lever 6 and the locking member 51 respectively, which can prevent the components from staying in a semi-released state after unlocking, so that the cover 4 can restore a certain locking fit when it is closed again.

[0066] In another embodiment, it also includes a seat cover 10 and a seat locking mechanism 11. One end of the seat cover 10 is rotatably connected to the upper end of the frame 1 via a seat hinge shaft, and the bottom end of the other end of the seat cover 10 is provided with a downwardly extending seat locking hook 101. The seat lock mechanism 11 includes a lock body 111 fixed to the frame 1. The upper end surface of the lock body 111 has a lock hook inlet. The bottom end of the lock body 111 is movably connected to a lock tongue 112 that can cross the lock hook inlet and a release part 113 connected to the lock tongue 112. The pressing part 61 is distributed between the battery sleeve 2 and the closed seat cover 10, and the lower surface of the seat cover 10 covers the pressing part 61 when the seat cover 10 is closed.

[0067] In the above embodiment, the seat cover 10 extends above the frame 1, with one end rotatably connected to the frame 1 via a seat hinge shaft, and the other end having a seat hook 101 extending toward the lock body 111. The seat hook 101 may consist of a connecting section and a latching section located at the lower end of the connecting section. When the seat cover 10 is closed, the latching section enters the lock body 111 through the hook inlet and pushes the latch 112, which is movably disposed at the bottom of the lock body 111, to temporarily avoid it. After the latching section passes the latch 112, the latch 112 resets and crosses the hook inlet, preventing the seat hook 101 from exiting in the opposite direction of entry. The latch 112 is linked with the release part 113. When the release part 113 is driven, it drives the latch 112 to open the hook inlet, thereby releasing the connection between the seat cover 10 and the frame 1. The pressing part 61 of the unlocking lever 6 is located above the battery sleeve 2 and between the closed seat cover 10 and the battery sleeve 2. After the seat cover 10 is locked, its lower surface covers the pressing part 61, so that external force cannot be directly applied to the unlocking lever 6.

[0068] The locking component 5 can thus maintain the sealing state of the cover 4. The axial limit formed by the cover 4 on the battery module 3 is not easily released due to accidental contact. The battery module 3 remains stable within the position determined by the guide structure, reducing the transmission of additional load to the male end connector 24 and the female end connector 32 due to axial movement.

[0069] In another embodiment, a lock cylinder 12 is fixedly provided on one side of the frame 1, and the lock cylinder 12 is provided with a rotation output component 13 that rotates with the key; A flexible cable 14 is connected between the lock cylinder 12 and the seat lock mechanism 11. Several outer sleeves are sleeved on the outer periphery of the flexible cable 14. At least two outer sleeves are fixedly connected to the lock cylinder 12 and the lock body 111, respectively. The two ends of the flexible cable 14 are respectively connected to the rotating output component 13 and the release part 113. When the rotating output component 13 pulls the flexible cable 14, the release part 113 drives the lock tongue 112 to exit the latching position of the seat lock hook 101.

[0070] In the above embodiment, the lock cylinder 12 is fixed to a position on the side of the frame 1 for easy key operation, and the rotation output component 13 inside the lock cylinder 12 can generate traction displacement as the key is rotated. The flexible cable 14 extends along the structure of the frame 1 to the seat lock mechanism 11, and its two ends are connected to the rotation output component 13 and the release part 113 respectively; the outer sleeve sleeved on the outer periphery of the flexible cable 14 constitutes the support and guide structure of the cable, wherein one outer sleeve near the lock cylinder 12 is fixed to the installation area of ​​the lock cylinder 12, and the other outer sleeve near the lock body 111 is fixed to the lock body 111, so that the flexible cable 14 between the two fixed positions can be arranged to bend with the space of the frame 1, and will not move as a whole when stretched.

[0071] When the key drives the output component 13 to operate, the flexible cable 14 experiences traction displacement relative to the outer sleeve. The release part 113 then causes the latch 112 to disengage from the seat latch hook 101, allowing the seat cover 10 to open around the seat hinge axis and expose the pressing part 61. The lock cylinder 12 and the locking assembly 5 of the cover 4 remain spatially separated. The flexible cable 14 only controls access to the pressing part 61 and does not directly bear the axial load of the battery module 3. The battery module 3 is still held together by the guide structure, the cover 4, and the locking assembly 5, thus preventing the key drive components from participating in battery positioning and being subjected to repeated vehicle vibration loads.

[0072] This invention also provides an electric drive vehicle, characterized by employing a battery expansion structure as described in any of the preceding claims. The electric drive vehicle includes a frame 1, a drive mechanism, and a battery expansion structure mounted on the frame 1. A battery sleeve 2 in the battery expansion structure is fixedly arranged longitudinally along the frame 1. A battery module 3 can be inserted into a receiving cavity 21 along the axial direction of the battery sleeve 2 and, after being inserted into a predetermined position, is electrically connected to the vehicle's power supply circuit to provide electrical energy to the drive mechanism. By adding a battery sleeve 2 and a corresponding battery module 3 within the frame 1, the battery loading capacity can be increased without affecting the basic structural layout of the vehicle. Furthermore, the battery module 3 can be installed and removed according to actual range requirements, thereby improving the battery expansion capability and ease of use of the electric drive vehicle.

[0073] The above description is merely a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A battery extension structure for an electric drive vehicle, characterized in that, It includes a frame and at least one battery sleeve fixed within the frame, the battery sleeve extending longitudinally along the frame, the battery sleeve having a receiving cavity formed inside and an opening at one end forming a loading and unloading port; The cavity contains a battery module. A first guide and a second guide are provided between the cavity and the battery module, respectively, and they slide along the axial direction of the battery sleeve. The bottom wall of the cavity and the battery module are electrically connected by insertion. The battery module enters and exits the cavity through the loading and unloading port.

2. The battery extension structure for an electric drive vehicle according to claim 1, characterized in that, The bottom wall of the cavity and the battery module are respectively provided with male and female connectors for mutual insertion; The loading and unloading port is hinged with a sleeve cover for sealing the battery module. The outer periphery of the battery sleeve is provided with a locking component. The locking component is used to apply a locking force along the axial direction of the sleeve cover to the sleeve cover in the sealed state. The outer periphery of the battery sleeve is rotatably provided with an unlocking rod extending along the axial direction of the battery sleeve. One end of the unlocking rod is used to pry the locking component, and the other end forms a pressing part away from the loading and unloading port.

3. The battery extension structure for an electric drive vehicle according to claim 2, characterized in that, The battery sleeve includes a cylindrical body that forms a receiving cavity. A mounting seat extending axially along the outer periphery of the cylindrical body is provided. The end face of the mounting seat away from the cylindrical body is recessed to form a receiving groove for receiving and swinging the unlocking rod. A hinge seat is provided on the side of the loading and unloading port away from the mounting base, and the hinge seat is rotatably connected to the sleeve cover.

4. The battery extension structure for an electric drive vehicle according to claim 3, characterized in that, The mounting base has a locking groove at one end near the loading / unloading port, the locking component is disposed in the locking groove, and one end of the unlocking rod extends into the locking groove in an L-shape.

5. The battery extension structure for an electric drive vehicle according to claim 3, characterized in that, The first guide portion consists of two oppositely arranged strip slides, which protrude along the cylinder towards the receiving cavity and extend along the axial direction of the cylinder, and have two opposite guide sides. The second guide portion consists of two oppositely arranged sliding grooves. The sliding grooves are recessed along the outer peripheral surface of the battery module and extend along the axial direction of the battery module. The sliding grooves have oppositely arranged sidewalls. The strip rail extends into the corresponding sliding groove, and the two guide sides slide in cooperation with the two sidewalls respectively.

6. The battery extension structure for an electric drive vehicle according to claim 5, characterized in that, The battery module includes a cylindrical housing adapted to a receiving cavity, the cylindrical housing having an insertion end near the bottom wall of the receiving cavity and an operating end facing the loading and unloading port; The slide grooves pass through the insertion end and the operating end respectively. The female end connector is embedded in the insertion end. The operating end is provided with a handle. The two slide grooves pass through the opposite sides of the handle respectively.

7. The battery extension structure for an electric drive vehicle according to claim 3, characterized in that, The sleeve cover includes a cover plate corresponding to the loading and unloading port and a surrounding edge extending from the periphery of the cover plate toward the battery sleeve. When the sleeve cover is in a sealed state, the surrounding edge is provided around at least a portion of the outer periphery of the tail end of the cylinder. The lower part of the cover plate is provided with two hinge ears arranged at intervals. The hinge seat is located between the two hinge ears. A hinge pin is rotatably inserted between the hinge seat and the two hinge ears. The side of the cover plate away from the hinge ears is provided with a locking part extending along the axial direction of the cover, which is used to extend into the locking groove and cooperate with the locking assembly to lock.

8. The battery extension structure for an electric drive vehicle according to claim 7, characterized in that, The latching part is an L-shaped plate latch. The free end of the latching part forms an inlet ramp, a transition top and a locking step in sequence along the entry direction when the cover is in the sealed state. The inlet ramp is inclined relative to the extension direction of the plate latch, and the locking step has a locking surface facing the opening direction of the cover.

9. The battery extension structure for an electric drive vehicle according to claim 8, characterized in that, The locking assembly includes a locking member that cooperates with the latch portion to block and a first elastic member that applies a locking force to the locking member. The locking groove is provided with a guide hole for the locking member to slide. The end of the locking member is slidably disposed in the guide hole, and the first elastic member is distributed in the guide hole. The guide hole passes through the end of the mounting base away from the cylinder, and a cover plate is fixedly provided on the end face of the guide hole. The opposite ends of the first elastic member abut against the cover plate and the locking member, respectively.

10. The battery extension structure for an electric drive vehicle according to claim 9, characterized in that, The guide holes are distributed in a direction perpendicular to the axis of the cylinder, and the guide holes include two symmetrical sets. The two ends of the locking member are slidably connected to the two guide holes, and the L-shaped end of the unlocking rod abuts against the bottom end of the locking member.

11. The battery extension structure for an electric drive vehicle according to claim 10, characterized in that, The unlocking rod has shaft holes on both sides, and a pivot pin passes through the shaft holes. The two ends of the pivot pin are rotatably connected to the two side walls of the receiving groove. The pivot pin separates the unlocking rod into an operating arm extending toward the receiving cavity and a lifting arm extending toward the loading and unloading port. The end of the operating arm forms a pressing part with a width greater than the width of the unlocking rod body, and the end of the lifting arm is bent toward the locking member to form an L-shaped end of the unlocking rod.

12. The battery extension structure for an electric drive vehicle according to claim 11, characterized in that, The operating arm is provided with a spring positioning part on one end face facing the bottom wall of the receiving groove, and a second elastic element is provided between the spring positioning part and the bottom wall of the receiving groove. The second elastic element is distributed between the pivot pin and the pressing part. The second elastic member biases the operating arm away from the bottom wall of the receiving groove and biases the lifting arm towards the bottom wall of the receiving groove, so that when the pressing part moves toward the bottom wall of the receiving groove, the lifting arm swings upward around the pivot pin to lift the locking member.

13. An electric drive vehicle, characterized in that, The battery extension structure of the electric drive vehicle as described in any one of claims 1-12 is adopted.

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